It is a somewhat darker topic, although the lyrics don't initially pull you straight down that road, the open ending is an interesting one, I definitely enjoyed that little detail. The interesting thing about this for me, is that the focus of the song, the protagonist if you will, is struggling with something although we don't really find out what. At a guess I would say that the character lacks self belief or esteem in some regard, not feeling worthy of the 'sunshine and good life' that are depicted in this song.